Open blank line above current line

`O`

All hotkeys for Vim (Linux)

Cursor Movement Move left	`h`
Cursor Movement Move down	`j`
Cursor Movement Move up	`k`
Cursor Movement Move right	`l`
Cursor Movement Jump by start of words	`w`
Cursor Movement Jump by words	`W`
Cursor Movement Jump to end of words	`e`
Cursor Movement Jump to end of words (no punctuation)	`E`
Cursor Movement Jump backward by words (punctuation considered words)	`b`
Cursor Movement Jump backward by words (no punctuation)	`B`
Cursor Movement Start of line	`0`
Cursor Movement First non-blank character of line	`^`
Cursor Movement End of line	`$`
Cursor Movement Go To command (prefix with number)	`G`
Cursor Movement Start insert mode at cursor	`i`
Cursor Movement Insert at the beginning of the line	`I`
Cursor Movement Append after the cursor	`a`
Cursor Movement Append at the end of the line	`A`
Cursor Movement Open (append) blank line below current line (no need to press return)	`o`
Cursor Movement Open blank line above current line	`O`
Cursor Movement Append at end word	`ea`
Cursor Movement Exit insert mode	`Esc`
Editing Replace a single character (does not use insert mode)	`r`
Editing Join line below to the current one	`J`
Editing Change (replace) an entire line	`cc`
Editing Change (replace) to the end of word	`cw`
Editing Change (replace) to the end of line	`c$`
Editing Delete character at cursor and subsitute text	`s`
Editing Delete line at cursor and substitute text (same as cc)	`S`
Editing Transpose two letters (delete and paste, technically)	`xp`
Editing Undo	`u`
Editing Repeat last command	`.`
Making text (Visual mode) Start visual mode, mark lines, then do command (such as y-yank)	`v`
Making text (Visual mode) Start Linewise visual mode	`V`
Making text (Visual mode) Move to other end of marked area	`o`
Making text (Visual mode) Start visual block mode	`Ctrl` + `v`
Making text (Visual mode) Move to other corner of block	`O`
Making text (Visual mode) Mark a word	`aw`
Making text (Visual mode) A () block (with braces)	`ab`
Making text (Visual mode) A {} block (with brackets)	`aB`
Making text (Visual mode) Inner () block	`ib`
Making text (Visual mode) Inner {} block	`iB`
Making text (Visual mode) Exit visual mode	`Esc`
Visual commands Shift right	`>`
Visual commands Shift left	`<`
Visual commands yank (copy)marked text	`y`
Visual commands Delete marked text	`d`
Visual commands Switch case	`~`
Cut and Paste Yank (copy) a line	`yy`
Cut and Paste Yank 2 lines	`2yy`
Cut and Paste Yank word	`yw`
Cut and Paste Yank to end of line	`y$`
Cut and Paste Put (paste) the clipboard after cursor	`p`
Cut and Paste Put (paste) before cursor	`P`
Cut and Paste Delete (cut) a line	`dd`
Cut and Paste Delete (cut) the current word	`dw`
Cut and Paste Delete (cut) current character	`x`
Exiting Write (save) the file, but don't exit	`:w`
Exiting Write (save) and quit	`:wq`
Exiting Quit (fails if anything has changed)	`:q`
Exiting Quit and throw away changes	`:q!`
Search/Replace Search for pattern	`/pattern`
Search/Replace Search backward for pattern	`?patten`
Search/Replace Repeat search in same direction	`n`
Search/Replace Repeat search in opposite direction	`N`
Search/Replace Replace all old with new throughout file	`:%s/old/new/g`
Search/Replace Replace all old with new throughout file with confirmations	`:%s/old/new/gc`
Working with multiple files Edit a file in a new buffer	`:e filename`
Working with multiple files Go to next buffer	`:bnext`
Working with multiple files Go to previous buffer	`:bprev`
Working with multiple files Delete a buffer (close a file)	`:bd`
Working with multiple files Open a file in a new buffer and split window	`:sp filename`
Working with multiple files Split windows	`Ctrl` + `ws`
Working with multiple files Switch between windows	`Ctrl` + `ww`
Working with multiple files Quit a window	`Ctrl` + `wq`
Working with multiple files Split windows vertically	`Ctrl` + `wv`